You can do some things that help a little but it's not gonna change a lot. Training shot blocking will help, as well as OD and ID and stamina so it's not under 5 anymore. Then playing a slow pace and matching him up with a player that doens't draw many fouls can help too.
SB is arguably the most important skill, as a big with high ID but low SB Will contest many shots, but foul because his inability to properly block the shot.
I think OD help a lot with the foul trouble, i have two bigs with approx the same skill (one 16 id 6bl, the other 15 id 8 bl) but the one with high od makes less fouls (1.3 for 33 minutes) instead the other one a bit more (2.3 for 31 minutes)because the low od. I dunno if SB help a lot with fouls but the hidden skill it's very relevant and a player born aggressive will never be a saint